German submarine U-124 (nickname "Edelweissboot"[1]) was a Type IXB U-boat of Nazi Germany's Kriegsmarine during World War II.

She operated in the Atlantic as part of the 2nd U-boat flotilla, both west of Scotland and east of the eastern US coast.

The core of the crew came from Schulz's previous command, U-64, which had been sunk during the Norwegian campaign, the survivors had been rescued by Wehrmacht mountain troops and their badge, the Edelweiss, was painted on U-124's conning tower in appreciation.

The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4,400 metric horsepower (3,240 kW; 4,340 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 metric horsepower (740 kW; 990 shp) for use while submerged.

Striking rocks on the sea-bed, the boat lay there for an hour, the corvette lost contact, but the collision had damaged three of her torpedo tubes.

The next day, 17 October, the Royal Navy River-class submarine HMS Clyde fired three torpedoes at her.

U-124 went on to sink another four ships; Cubano, Sulaco (there was only one survivor) both on 20 October, Rutland on the 31st and the Empire Bison on 1 November.

U-124 attacked north of the Cape Verde Islands during the night of 7/8 March and sank four ships: Nardana, Hindpool, Tielbank and Lahore.

During this patrol U-124 also rendezvoused with the heavy cruiser Admiral Scheer in order to give her a Quartz spare part for her defective Seetakt radar.

A final effort on 26 September accounted for three more ships, also near the Azores: Petrel, Cortes, and Siremalm (there were no survivors from the latter vessel).

On 24 November, she was engaged by the Royal Navy Danae-class cruiser HMS Dunedin which, with two consorts, had been searching for the Armed Merchant Raider Atlantis and her supply ship Python.

Dunedin was hit by two torpedoes, despite being outside the theoretical range of the U-boat's projectiles and sank 17 minutes later.

[4] She was the fourth and last American ship to be sunk by the U-boat Arm prior to the U.S. entry into the war.

U-124 was shelled by the coastal battery at Fort Bedford, Georgetown on Ascension Island on 9 December; no damage was sustained.

[5] The boat scored her first victory before reaching her destination; sinking British Resource about 230 nautical miles (430 km; 260 mi) north of Bermuda on 14 March.

U-124's next victim was the Free French corvette Mimosa which was sunk with heavy loss of life on 9 June.

Another change of operational zone, this time to the northern coastal area of South America.

She sank Trewloras about 50 nautical miles (93 km; 58 mi) east of Port of Spain, Trinidad on 28 December.

Heading southwest, she had hardly left the Bay of Biscay when she was attacked and sunk by two British warships, the Flower-class corvette HMS Stonecrop and Black Swan-class sloop HMS Black Swan west of Oporto in Portugal 2 April 1943.